Steel or iron pillar particularly adapted for mounting electric wires



April 2, 1929- NOZAWA 1,707,871

STEEL 0R IRON PILLAR FARTICUMRLY ADAP'I'ID FOR IOUNTING ELECTRIC IRESFiled May 11, 1923 2 suns-shun 1 Me lbw. Iahz'ro lvxmw fi w, MW, 00%

April 2, 1929. I. NOZAWA 07,8

STEEL OR IRON PILLAR PARTICULARLY ADAPTED FOR IOUNTING ELECTRIC WIRESFiled llay 11, 1923 2 Sheets-Sheet 2 Patented Apr. 2, 1929.

UNITED STATES v 1,707,871 PATENT OFFICE.

ICHIRO trauma, or TOKYO, JAPAN.

STEEL OR IRON PILLAR PARTICULARLY ADAPTED FOR MOUNTING ELECTRIC WIRES.

Application filed May 11- This invention relates to steel and ironcolunms )articularly adapted for supporting electric wires. Heretoforeit has been'customary to use diagonal bracings or truss members on theouter surface of each of the members constituting the column. There is,however, the drawback that while such bracings afford a resistance to anexternal force acting in a direction parallel to the plane of thebracings, there is nothing to resist an external force acting in adirection normal to the plane of thebracings. It has therefore steel oriron in order to strengthen the column so as to resist external forcesin all directions.

The object ofthis invention is to overcome the above defects by theemployment of di agonal bracings which do not lie in the plane of theouter side of each component member, but which are securedto the flangesof'the members internally thereof and diagonally Within the surface ofthe members. In this way any desired column can be constructed veryeconomically and at the same time so as to afford much greater strength.

The foregoing and other features are hereinafter referred to, and theinvention will now be described with reference to the accompanyingdrawings inwhich:

Fig. 1 is a front elevation of a column embodying the present invention.

Fig. 2 is a side elevation thereof.

Fig. 3 is a section on Fig. 1.

Figs. 4, 7 and 10 are each front elevations of modifications of thepresent invention.

Figs. 5, 8 and 11 are side elevations of Figures 4,7 and 10respectively. 7

Figs. 6, 9 and 12 are sections of Figures 4, 7 and 10 respectively.

Figs. 13, 14, 15 and 16 are diagrammatic views explaining the resistanceof the various members to external bending forces.

Figs. 17 and 18 are elevations of typical assembled necessary parts.Fig. 17 being a further modification in which the diagonal members beginintermediately the plane of the transverse pieces and terminate in saidplane, while Fig. 18 is the'column shown in Fig. 4, but constructed soas to taper towardconstructions of the present invention with 1923.Serial No. 688,872.

rear flange b, of the member B is joined lower down to the front flange.a ofmember A by a brace 0 while the rear flange a, of member A is joinedlower down to the front flange 6 of the member B, b a brace 0 Both thebraces 0 and 0 are t us diagonal braces. In the same manner otherdiagonal braces 0 are used to interconnect the flanges of the members Aand B as shown in the drawings.

The braces are connected to the angles, by any desired means,

1 and the like. been necessary to employ a large amount of Now assume,in Figs. 13 and 14, that an external force F acts at a point 7 on theend of a column secured to the ground or any other body, represented bythe line GL. In this case various stresses are brought into play but tosimplify the following treatment, only the principal stresses will betaken into consideration.

In Fig. 13, if an external force Facts as indicated, a rectangle a b b aformed by the various members is subjected to a strain tending to deformthe rectangle into a parallelograma b b a as in Fig. 14. Let us supposethe braces (1,6,, and a l), tobein the same vertical plane as therectangle a b b a, in which case the diagonal brace b a, is subjected toa compression force F while brace a l), is subjected to a tension F sothat the external force F- is resisted by a compression stress in themember A, a tension stress in the member B, a compression stress F inbrace (1,6,, and a tension, F in brace a 12,. However, as the diagonalbraces (1 12 and a l) are not situated in the same plane as therectangle a b b a in the actual construction, the compression stress Fis divided into two components F 0 and F s at the point a as shown inFigs. 13

. and 15. The component F thrusts forward on front flange a, of themember A and tends to twist the flange forward and at the same time thetension stress F will act at the point a, on the diagonal brace a b Thetension stress F is divided into two components, F and F while thecomponent F is balanced by F so as to eliminateany torque on flange a Itwill therefore be seen that the resistance afforded by the givenconstruct-ion covers tension and compression stresses due to compressionmember a b tension member a 6 and the members A and B.

- If a force P acts at the point p in a direction opposite to the forceF, the rectangle a b b a will become deformed in the opposite directionto that above-mentioned to make a such as riveting, welding,

. the bending stress all'orded by the members 'on the side b zl.

resists the external force IV and at the same time the stresses producedby dlagonal braces 0 and c also resist the external force. 7

Let us consider, 1n Figure 16, that the-external force W is divided intotwo components w and acting respectively at the two points a 1),. at thepoint 6 and a bending stress is produced due tothe component 10,, toresist the external force IV, while at the same time a stress isproducedon the diagonal bracing 0,. It 0 represents a rear flange havingits 'terminal'edge in the same plane as that of the front edge a of themember A, perpendicu- I lar to the plane passing throughthe apices ofthe angle member and we assume the component force to, to act-at theapex of a triangle b 66 0, it is evident that a compression stress isproduced on the side a l) and a twisting stress on the side a e, sothata compression stress is produced to resist the external force W onthe diagonal bracing a l), tostrengthen the members A and B.

Again, if d represents a front flangehaving its terminal edge in thesame plane as that of the rear flange?) of the member B, perpendicularto the planepassing'through the apices ofthe angle member some componentforce w, of external force W may be assumed to act at the apex a, of thetriangle a clb In this caseit will be seen that a-tension stress isproduced on the side a l) and a twisting stress In other words, atension stressgis produced on the diagonal brace b a (previouslymentioned as 0 in opposition to IV so as to strengthen the structure ofthe members A and B.

. 'It should be noted that the component out compression stress producedon the diagonal brace ch6 (previously referred to as 0 thrusts forwardlyon the'flang-e a, to produce a twisting stress a. At the same. time thetension stress produced on the brace a 6 gives rise to a twisting stress8 acting at (L to eXerta force thrustmg rearwardly on the flange. Inshort,'the forces 8 and 8, counteract so as to eliminate twisting. Theseare the characteristic features ofthe present 'invention.

Ifan external force lV acts, instead otthe force WV in the oppositedirection to the'latv ter, it Will be secininthe triangle a 'b c, thatThe component force 4.0 acts in contradistinction to the case of theexternal force IV, a tension stress is produced on the side a l), or thebrace 0 and a compression stress on the side a l), or the brace 0 so asto strengthen the members A and B.

Furthermore, the horizontal joining members or braces such as ab, 22etc., do not atford stresses to resist external force, except 111 someparticular easeswhere a horizontal component of an external force is tobe overcome. This means that horizontal braces do not'pertorm thefunction of reinforcing the column and particularly to resist externalforces IV or The group of Figures 4 to 6 inclusive illustrates aconstruction in which double diagonal braces are shown, lyingsubstantially in a single plane as indicated in Fig. 5, and beginning ata cross piece on one side-of the angle member and terminating on anupperor lower cross piece on the opposite side.

In the group of Figures 7 to '9 inclusive, the construction issubstantially similar to that shown in Figs. i to 6, exceptthat channelirons are used instead of angle irons. In the group otFigures 10 to12,-the diagonal braces v begin and terminate, intermediate the planesof the cross pieces, and they a-re also in the planes of the edges ofthe angle members which they connect,

Figs. 4 to 6 and 7 to 9 inclusive, show the employment or" doublediagonal bracings the first named group of figures illustrates a col umnconstructed of v members while Figs. 7 to 9 show the same type ofconstruction of braces, applied to channel members and the constructionin each figure is similar to that in Figs. 1, 2and'3. It should be notedthat as the diagonal braces each secure together the flanges of oppositesides of the main members constituting the column, in every figurerepresenting front elevations, side elevations or cross sectional planviews, diagonal braces are situated in diagonal perspective positions,which tact constitutes a novel feature of the invention, ail'ording aresistance to external force of any direction.

Figs. '10, 11 and 12 are modifications of diagonal braces in which onepair, or two pairs, of elongated bars are bent at 71, m,

m is andso on in Zigzag fashion. In each figure an elongated bar iswelded to the flanges at the indi *ated points, being diagonallypositioned on the members K and M.

In these constructions, diagonal braces formed by welding an elongatedbar, or bars, to various flanges, are to be used in place of diagonalbraces as in Figs. 1, 2' and 8.

In Figs. 1? and 18 a: practical application o'tthe invention is shownthe column of the former figure being constructed in thesame manner asthat shown in Fig. 4 but with a slight tapering toward the upper end.Fig. 17 showing a column ofthe same cross section 'except that a singlesystem of diagonal bracing is used instead of a system of intersectingbraces.

lVhat I claim is:

1. A support for mounting electric Wires, comprising, two angle barssymmetrically positioned vertically and in spaced relation,

the flanges thereof being positioned towards each other, a diagonalbrace connecting the rear flange of one of the bars to the forwardflange of the other bar, and a second diagonal brace connecting the rearflange of the latter bar to the forward flange of the former bar.

2. A support for mounting electric wires, comprising, two angle barssymmetrically positioned vertically and in spaced relation, the flangesthereof being positioned towards each other, a double diagonal bracingconnecting the rear flange of one of the bars to the forward flange ofthe other bar, and a second double diagonal bracing connecting the rearflange of the latter bar to the forward flange of the former bar.

3. A support for mounting electric wires, comprising, two angle bars,symmetrically positioned vertically and in spaced relation, the flangesthereof being positioned towards each other, an oblique memberconnecting the rear flange of one of the bars to the forward flange ofthe other bar, a second oblique member connecting the rear flange of thelatter bar to the forward flange of the former bar. Signed at AmericanEmbassy, Tokyo, this 17th day of April, A. D. 1923.

ICHIRO NOZAWA.

